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No worries! Blame sits squarly with my father in law who "helped" me

Plumbers been, after isolating the cold water feed into the boiler he was getting mains pressure from the hot, so has diagnosed a cross pipe somewhere. Argh!

I'm no pro, but I painted the bare brick with watered down sbr, then dot and dabbed the boards, with 6 mechanical fixings per board, with washers.

Plumber coming tomorrow, will report back

Having a play, and d36 is reading 0l/min even with the tap on. Would that point to the flow sensor being dirty? Given I've had to clean out every tap filter today because they were all blocked with crappie suggests it maybe jammed? Or am I way off track?

Sorry for the delay, been fitting the bath today.

D35 100% D70 0

Hypothetically, could having the cold and hot feeds switched round cause this? We wouldn't notice any difference in the taps, as they get the cold feed before the potential switch. I did trace them, but may go and double check.

Will do. Might be tomorrow, but thanks for your help so far!

I did wonder how it purged the hot water system!

Heating works, no hot water from taps. Pressure and flow of water from the taps is as I would expect. Stopcock fully open, new pipework traced to ensure we haven't swapped hot and cold over. Can hear water flowing through boiler

Apparently the purge on my boiler has a hot water and heating purge. Least according to the icons and the manual I found online :unsure: Mainly rerouting pipes, installing stop cocks. Pressure and flow are normal, as is the cold, just no heat

Just to add to this, after another round of plumbing today, the boiler now refuses to heat water. No error codes, just doesn't fire up when tap turned on. Tried the purge program, but no joy I'm guessing all the cr@p that is making my water brown has buggered something up, or is symptomatic...

I thought it could be the air that gets into the system stirring up crap, but not sure exactly where the crap could be coming from, and why it's now happened 3 times in a couple of weeks

I thought the expansion vessel was just for the heating side. Learn something new everyday! I'll take a look

It's a valient ecoFIT I think. It's also in the loft, so right at the top of the system is that makes a difference

Hi, I'm refitting my bathroom at the moment, so turning the water off quite a bit. When I do, I leave a tap open downstairs and then open one upstairs to drain the system (combi boiler) so I don't get wet when cutting pipes. When the system refills, I get brown water for a few seconds from my...

The rock wool, but it's close enough to make little difference

I worry sometimes that my DIY is cr@p, then I see what people get paid to do, and realise I'm actually pretty good at DIY

I'd be careful if you are extending it, in case a neighbour who doesn't like you shops you into the planning dept